Technetium-87

Properties and data of the isotope ⁸⁷Tc.

Contents

General data

Name of the isotope:Technetium-87; Tc-87Symbol:⁸⁷Tc or 8743TcMass number A:87 (= number of nucleons)Atomic number Z:43 (= number of protons)Neutrons N:44Isotopic mass:86.938067(4) u (atomic weight of Technetium-87)Nuclide mass:86.9144792 u (calculated nuclear mass without electrons)Mass excess:-57.69022 MeVMass defect:0.77966568000001 u (per nucleus)Nuclear binding energy:726.25390293 MeV (per nucleus)
8.34774601 MeV (average binding energy per nucleon)Separation energy:S_N = 14.19(30) MeV (first neutron)
S_P = 0.869(6) MeV (first proton)Half-life:2.2(2) sDecay constant λ:0.31506690025452 s^-1Specific activity α:2.206252620507 × 10⁺²¹ Bq g^-1
59628449202.903 Ci g^-1Spin and parity:
(nuclear angular momentum)(9/2+)Mirror nucleus:Ruthenium-87Year of discovery:1991

Radioactive Decay

Half-life T_½ = 2.2(2) s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
EC/β⁺	⁸⁷Mo	100 %	9.195(5) MeV

Nuclear Isomers

Nuclear isomers or excited states with the activation energy in keV related to the ground state.

Nuclear Isomer	Excitation Energy	Half-life	Spin
^87mTc	71+x keV	647(24) ns	(7/2+)

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 44) and isobaric (same nucleon number A = 87) with Technetium-87. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

Z	Isotone N = 44	Isobar A = 87
23	⁶⁷V
24	⁶⁸Cr
25	⁶⁹Mn
26	⁷⁰Fe
27	⁷¹Co
28	⁷²Ni
29	⁷³Cu
30	⁷⁴Zn
31	⁷⁵Ga	⁸⁷Ga
32	⁷⁶Ge	⁸⁷Ge
33	⁷⁷As	⁸⁷As
34	⁷⁸Se	⁸⁷Se
35	⁷⁹Br	⁸⁷Br
36	⁸⁰Kr	⁸⁷Kr
37	⁸¹Rb	⁸⁷Rb
38	⁸²Sr	⁸⁷Sr
39	⁸³Y	⁸⁷Y
40	⁸⁴Zr	⁸⁷Zr
41	⁸⁵Nb	⁸⁷Nb
42	⁸⁶Mo	⁸⁷Mo
43	⁸⁷Tc	⁸⁷Tc
44	⁸⁸Ru	⁸⁷Ru
45	⁸⁹Rh
46	⁹⁰Pd